CollapsibleFilter: Filter out if _id is null.

Author: Koji Miyauchi

lib/CollapsibleFilter/CollapsibleFilter.js

@@ -109,7 +109,9 @@ var CollapsibleFilter = function (_React$Component) {
                 { className: 'wfui-filter-group' },
                 _react2.default.createElement(_FilterItems2.default, {
                     label: label,
-                    filterItems: filterItems || filters[type].sort(function (a, b) {
+                    filterItems: filterItems || filters[type].filter(function (a) {
+                        return a._id;
+                    }).sort(function (a, b) {
                         return a._id.localeCompare(b._id);
                     }).map(function (item) {
                         return { _id: item._id, key: item._key || item._id, count: item.count };

src/CollapsibleFilter/CollapsibleFilter.jsx

@@ -47,7 +47,7 @@ class CollapsibleFilter extends React.Component {
             <div className="wfui-filter-group">
                 <FilterItems
                     label={label}
-                    filterItems={filterItems || filters[type].sort((a, b) => (a._id.localeCompare(b._id))).map(item => ({ _id: item._id, key: item._key || item._id, count: item.count }))}
+                    filterItems={filterItems || filters[type].filter((a) => (a._id)).sort((a, b) => (a._id.localeCompare(b._id))).map(item => ({ _id: item._id, key: item._key || item._id, count: item.count }))}
                     type={type}
                     category={category}
                     onHandleClick={this.onHandleClick}